Soucis hack batterie lego techincs

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bonjour à tous
Élève de terminale s option si, je passe les épreuves de projet.
mon équipe et moi hackons les moteurs lego technics afin de les controler via la carte arduino.

mon montage électrique est composé de transistors. Étant fini, je le test grâce à des leds. tout marche sur le gnd et le 5v de la carte arduino, mais au moment de tester avec la batterie lego, rien ne marche!  :o
pourtant la batterie fonctionne! je l'ai testée!

voici une image des contacts de la batterie:



voici une image du montage:



le problème survient lorsque je change la source du courant, lorsque je passe du 5v et gnd de la carte arduino et du 9v et gnd de la batterie.

merci de votre aide!

bonjour,

l'arduino est alimenté comment quand tu utilises la batterie?
si l'arduino est toujours alimenté par l'usb, il ne faut pas oublier de relier le gnd de l'arduino et le 0v de la batterie.


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